Sybujge



F. WACKENHUTH.

SYHINGE. APPLICATION FILED NOV. 23. l9l5.

Patented Sept. 9, 1919;:

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ou F. Qu 8 E m l W onirica.

FREDERICK WiAUTH, OF IEW JERSEY.

SYBINGE.

lSpeeleatlon ofinetters Intent. i patented Sept. 9, 1919.

application ned .november 23.1915. serial no. 63,131.

and the objects of the same are to increase i the strength and durability of such a de vice by making its ni plev of metal, to prevent contact of the liquid with any metal part by lining the latter with aseptic coating such as glass, to prevent accidental loss of the plunger from the barrel by providing a spring bearing frictionally u on the stem of the plunger, and to `provi e new means for fastening the scale within the plunger.

Other objects will appear in the following specification, reference being had to the accompanying drawin wherein Figures l, 2, 3, an 4 are longitudinal sections of various embodiments of this idea, the plunger being omitted from Fig. 2.

Fig. 5 is a sectional detail of the needle socket.

Figs. 6, 7 and 8 are sectional details of various forms of closures for the lower end of the barrel.

Fig. 9 is a sectional detail of the lining for the nipple. o

Fig. 10 is a section on the line 10-10 of 4ig. 11 is a detail show-ing the present form of nozzle in glass syringes.

In any embodiment of my invention, the

.barrel 2 is of glass which is cylindrical throughout its length and open at its upper end, and within the barrel reciprocates a tubular glass piston or plunger 1 having a projecting handle or knob whose shape and size is unimportant. A finger rest 3 enc1rcles the upper end of the barrel and is main tained in position by a coiled spring 4, and as best seen in Figs. 1, l and 10, one end of the spring is extended past the finger rest and over the end of the barrel as at 5 and bears frictionally against the plunger to prevent the latter from dropping out and becomin broken, which so often happens with syringes of this kind Where no means are present to hold the plungerin p lace. .As seen in Fig. 4, when my invention is applied to tuberculin s ringes which are of small diameter and w erein the plunger if entirely of glass is easily broken, I prefer to make the piston pro er 16 of glass,'and cement into it a metal ie rod 17 which asses slidably through a cap 18 lon the end o the barrel and carries a knob 19 as shown. In any case, however, thei piston portion of the plunger which is of glass will be ound so as to make a leak-proof connection with the in terioi` of the`g'1ass' barrel.

It is well known that syringes of this kind are sterilized before being used, and if any element is marked on the exterior with line graduations they soon become eifaced or i indistinct yunder thehigh temperature used in sterilization; Accordingly I have placed raduations' on a stri 21 of plapei' orthe ike, and the strip is p aced wit in the tubular lunger as indicated in Figs. 1 and 3. Whi e any suitable means may be employed for holding the paper in such position, Fig. 3 showsthat the plunger may be made in two parts whereof the outermost 1*l ts closely within the barrel and contains the scale 21, and the innermost 1b fits telesco ically into the otherwise open upper end o the outermost part and may have a bead 1c abutting against,` the extremity thereof when the parts are properly assembled and the scale 21 is held in place, and thereafterthese parts may be connected with each other in any suitable ".ihe lower end of the barrel of any ordinary syringe of this kind is usually reduced into an integral glass nipple as shown at 20 in Fig. 11, and onto this 1s slipped the needle socket when the device is to be used. But I find that nozzles of this. kind are often broken ofi", and I prefer therefore to use a nozzle or nipple made mostly of metal or entirely of metalexcepting for an aseptic lining within its bore. One type of my invention is illustrated in Figs. 1 and 6. Here an externally -threaded metal `nipple 7 is formedrintegral With and coaxial With a in the barrel at its lower portion or end, and the nipple proj eatin g beyond the same to receive the open or female end of the needle socket 8 best shown in Fig. 5, packing .14 being employed when the parts are conrected. An aseptic lining 13 as of glass extends through the bores of the nipple and plug, and an aseptic lining covers the inner end of the plug as at 12. Thus the needle proper',

ion

` metal plug 1li),v the latter fitting closely lwith- Y 9, Vpasses through the packing 14 and the lining elements 13 and l2, and there is no opportunity foi-.the liquid within the barrel to come into contact with than the needle, For holdin this needlecarrying element 7, on the arrel, I may make use-of a ferrule or cap 6 havin a flat metal body pierced with a hole t rough any metal other which the nip le 'I is soldered, the body exbefand of the plug and barrel tending over t and terminating in arilange or skirt which closely embraces the lower portion of the barrel. The latter may be reduced and ground externally as at 1l so as t0 make a tillilt fit within said skirt.

' the type of .my invention shown in Fi'g.

y 2, the barrel is reduced atits lower end and nearly closed as at 27, the same nipple 7 is employed, the same plug 10 excepting that it is shorter, and the same elements; but in this case the nipple projects through an opening in the end of the barrel and-is lheld' in place by a nut 15.V In Figs. l and l 2, the metal parts maybe secured within the v fitting closely around y latter being ground as at 11. The type of my invention shown in Fig.` 4

plug 10" may be of glass or ozfY the barrel without the may employ any of the details 'above described, but this view is mainly for the urpose of illustrating the structure of the p un.- ger rod of metal as above described. t also shows the vuse of a spring for frictionally this detail could be used in any type of my invention; and the means for holding the paper scale 2l could be employed in any type of my invention where the plunger is tubular and transparent. The purposes of syringes of this kind are too well lmownto need further descr-i tion. p

What is claimed as new isz- 1. In a syringe having a barrel and plunu ger, the combination with a finger rest on the barrel, of a coiled spring-.fitted around. said barrel to maintain the finger rest in position, said springhaving an extension over the end of said barrel maintaining pressure against the plunger, for the purpose described. i

2. In Ya syringe, the combination with a glass barrel; of a glass plunger made up of two tubular parts whereof the outer its Ywithin the barrel and is closed at its lower end and the inner partts telescopically into theupper end .of said outer part, and a graduated scale within the outer ,part and held therein by the inner part when in place, subn stantially as described.' Y

FREDERICK WACKENHUTH. Witnesses :j

YEnfant' Kmart, Tn'nononn SCHANBAGENER. l

`retaining the plunger, although of course' 

